Migrate Chrome OS Bluetooth UI to the new discovery API.

chrome/browser/resources/options/chromeos/bluetooth_add_device_overlay.js

Index: chrome/browser/resources/options/chromeos/bluetooth_add_device_overlay.js
diff --git a/chrome/browser/resources/options/chromeos/bluetooth_add_device_overlay.js b/chrome/browser/resources/options/chromeos/bluetooth_add_device_overlay.js
index 3b076a1f26fb42e79028bd965ffc7db1a1b03073..4bc7f6cda75e0bc256013b44d90015c97ed73f49 100644
--- a/chrome/browser/resources/options/chromeos/bluetooth_add_device_overlay.js
+++ b/chrome/browser/resources/options/chromeos/bluetooth_add_device_overlay.js
@@ -34,7 +34,6 @@ cr.define('options', function() {
       this.createDeviceList_();
 
       $('bluetooth-add-device-cancel-button').onclick = function(event) {
-        chrome.send('stopBluetoothDeviceDiscovery');
         OptionsPage.closeOverlay();
       };
 
@@ -42,7 +41,6 @@ cr.define('options', function() {
       $('bluetooth-add-device-apply-button').onclick = function(event) {
         var device = self.deviceList_.selectedItem;
         var address = device.address;
-        chrome.send('stopBluetoothDeviceDiscovery');
         OptionsPage.closeOverlay();

[keybuk, 2014/02/28 21:29:28]

While this looks like it closes the overlay, it immediately opens it again ...
so I'm not sure didClosePage would get called

We probably don't want the scan on while we're actually pairing, right?

[xiyuan, 2014/02/28 22:21:25]

This is probably okay. Pairing and this add device are two different overlays.
When OptionsPage.closeOverlay() is called, the current overlay's didClosePage is
called before returning.

https://code.google.com/p/chromium/codesearch#chromium/src/chrome/browser/res...

So even we show pairing overlay immediately after this, it is a different
overlay and does not affect the add-device overlay's didClosePage.

         device.pairing = 'bluetoothStartConnecting';
         options.BluetoothPairing.showDialog(device);
@@ -68,6 +66,11 @@ cr.define('options', function() {
       });
     },
 
+    /** @override */
+    didClosePage: function() {
+      chrome.send('stopBluetoothDeviceDiscovery');
+    },
+
     /**
      * Creates, decorates and initializes the bluetooth device list.
      * @private